Authorities expect to make more arrests in the sex-trafficking investigation of a self-help group that's already resulted in charges against former Smallville actress Allison Mack and the group's leader.

Keith pleaded not guilty and a court date was set for October 1st.

The actress, who is free on bail but under home detention, sat two chairs away from Raniere at the defense table, but there was no interaction.

"I have a wonderful teacher and mentor named Keith Raniere who really gave me some incredible guidance", she said in an interview with Fine Magazine a year ago. The women were also forced to engage in sexual acts with Raniere and have his initials branded into their pelvic area.

According to The Daily Mail, Mack spoke very little during Friday's court proceedings and avoided eye contact with Raniere, while he reportedly tried several times to catch her eye. She left court on Friday without commenting. Raniere and Natalie dated from 1991-1999 and Natalie labeled him as a "sociopath", claiming that he once told her, "The next time I see you, you'll be dead or in jail", when she made the decision to leave the sex cult before it became what it was.

Prominent backers of professional development company NXIVM have said they were in the dark about allegations by women who had defected from the group that they were forced to have sex with Raniere. Since the arrests, more and more women have come forward, detailing the horrific abuses they were subjected to.

Actress Allison Mack, center, leaves court with her legal team at Brooklyn Federal Court, Friday May 4, 2018, in NY.

Another person under close scrutiny is Nancy Salzman, NXIVM's president. She has been placed under house arrest with Global Positioning System monitoring at her parents' home in California. The government stated that they will be filing a protective order for all materials discovered as they contain "a lot of sensitive victim information".

Toni Natalie, who was Raniere's live-in girlfriend for much of the 1990s, and who today views herself as an advocate for former members of the group, said she "was thrilled to hear" that there are superseding indictments coming. "The Bronfman sisters have to be arrested. They knew this was wrong".